Pasteurization, invented by named after Louis Pasteur, is a process in which food or drink is heated to kill dangerous bacteria. Pasteurization is different from sterilization in that sterilization kills all life in its object while pasteurization only kills some organisms. Milk, for example, is pasteurized at 60 degrees Celsius (140 Fahrenheit) for 20 minutes.
Death Valley in California, the place with the hottest recorded temperatures on Earth, has reached 56 degrees Celsius, so any milk left outside in Death Valley is almost at the point of being continuously pasteurized.
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